Panic exit door locking structure

Claim 1

A door locking structure forming a panic exit device having in combination an elongated housing formed as an open-sided channel, an operating rod disposed longitudinally in said channel, a sealing member in said channel in spaced relation to said rod and movable inwardly and outwardly of said channel, a plurality of vertically spaced links pivoted in said channel intermediate their ends, said links each being pivoted at one end to said rod, said links each being pivoted at their other ends to said sealing member, a door operating means operating said rod to move said sealing member inwardly and outwardly of said channel by means of said links, deadlock means carried by said rod in operative relationship with said sealing member, a latching bolt carried at the upper end of said operating rod, a plate member slidably carried at the upper portion of said channel having an aperture therein, said latch bolt operated by said rod extending through said aperture of said plate member, said latch bolt having a ledge formed in the upper end portion thereof, a spring member normally urging said plate member to overlie said ledge of said latch bolt to retain said latch bolt in retracted position, said plate member having a portion extending outwardly of said channel, a door frame receiving said housing in a door closing position, and said extended portion of said plate member engaging said door frame and yielding to said engagement to release said latch bolt to have the same extend therethrough to latching position.